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Refactoring Python Network Automation for Unit Tests

Network operators who embrace automation to streamline their daily work often adopt software development best practices to ensure the applications they develop are stable and of the highest quality...

Cisco IOS - "No matching host key type found" During SSH

A common issue seen when attempting to SSH into a network device running Cisco’s IOS or IOS-XE operating system using an OpenSSH client is as follows: [email protected]:~$ ssh 192.168....

Cisco IOS - "No matching key exchange found" During SSH

A common issue seen when attempting to SSH into a network device running Cisco’s IOS or IOS-XE operating system using an OpenSSH client is as follows: [email protected]:~$ ssh 192.168....

How Security Scanners Cause Network Outages - CoPP and ARP Glean in Production Networks

Note: If you are not familiar with the concepts of the data plane and control plane on network devices, I highly recommend reviewing my Understanding the Data, Control, and Management Planes of ...

Defining Ethernet Physical Layer Terminology

Networking jargon can be context-sensitive, and many terms are often used interchangeably in conversation. In this article, I will define terms often used when discussing the physical layer of Ethe...

How to Create a Simple, Free Blog with Hugo and GitHub Pages

Authoring technical content is a skill. Like any skill, the only way to improve it is to practice. An easy way to author and share technical content is to create a blog and share your technology ex...

Bridge Network Interfaces on Ubuntu 22.04

Linux hosts can bridge two network interfaces together such that they behave link a normal Ethernet link. This means that traffic entering one network interface will exit the other network interfac...

Installing iPerf3 on Ubuntu 22.04

iPerf3 is a popular network performance measurement and testing tool that can be easily installed on most Linux operating systems. This article will walk through how to install iPerf3 on Linux host...

Understanding ARP Glean

Note: If you are not familiar with the concepts of the data plane and control plane on network devices, I highly recommend reviewing my Understanding the Data, Control, and Management Planes of ...

Illustrating Why the First ICMP Ping is Lost

Whether you are learning about computer networking through practice labs or are a veteran network administrator, you may have noticed that occasionally, when you test reachability to a specific dev...

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